A Small Population of Wallabies Lives on an Island That

Multiple Choice

A small population of wallabies lives on an island that was once connected to the mainland. Over many generations, several alleles have completely disappeared from the island population, although they are still present on the mainland. If the gene locus we were investigating contributed to the wallabies' efficient use of a particular food resource, the alleles may have disappeared from the island population due to

A) migration.
B) selection.
C) mutation.
D) inbreeding.
E) assortative mating.